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// SPDX-License-Identifier: GPL-3.0-or-later
#include "rcc/CodeGen/MachineInstr.h"
#include "rcc/CodeGen/MachineBasicBlock.h"
#include "rcc/CodeGen/MachineFunction.h"
#include "rcc/CodeGen/MachineMemOperand.h"
#include "rcc/CodeGen/MachineRegisterInfo.h"
#include <cstddef>
#include <functional>
#include <optional>
#include <utility>
namespace rcc {
MachineInstr::MachineInstr(MachineFunction &OwnerFunction, Opcode InstructionOpcode,
MachineInstrStableID StableID)
: OwnerFunction(&OwnerFunction), InstructionOpcode(InstructionOpcode), StableID(StableID) {}
MachineInstr::~MachineInstr() {
for (MachineOperand &Operand : Operands)
Operand.detachFromInstruction();
}
Expected<void> MachineInstr::setOpcode(Opcode NewOpcode) {
if (!NewOpcode.isValid())
return makeUnexpected(ErrorCode::InvalidArgument, "machine opcode must be nonzero");
InstructionOpcode = NewOpcode;
return {};
}
MachineOperand *MachineInstr::operandAt(std::size_t Index) noexcept {
if (Index >= Operands.size())
return nullptr;
return &Operands[Index];
}
const MachineOperand *MachineInstr::operandAt(std::size_t Index) const noexcept {
if (Index >= Operands.size())
return nullptr;
return &Operands[Index];
}
void MachineInstr::reserveOperands(std::size_t Capacity) {
Operands.reserve(Capacity);
}
Expected<void> MachineInstr::addOperand(MachineOperand &&Operand) {
return insertOperand(Operands.size(), std::move(Operand));
}
Expected<void> MachineInstr::insertOperand(std::size_t Index, MachineOperand &&Operand) {
if (Index > Operands.size())
return makeUnexpected(ErrorCode::InvalidArgument, "operand insertion index is out of range");
if (Operand.Parent != nullptr)
return makeUnexpected(ErrorCode::InvalidArgument, "operand already belongs to an instruction");
if (Operand.TiedOperandIndex)
return makeUnexpected(ErrorCode::InvalidArgument,
"detached operand cannot carry a tied operand index");
if (const auto *BlockOperand = Operand.getIf<BasicBlockOperand>();
BlockOperand != nullptr && &BlockOperand->Block->function() != OwnerFunction) {
return makeUnexpected(ErrorCode::InvalidArgument,
"basic block operand belongs to another machine function");
}
if (const Register *Reg = Operand.getIf<Register>();
Reg != nullptr && Reg->isVirtual() &&
!OwnerFunction->registerInfo().isKnownVirtualRegister(*Reg)) {
return makeUnexpected(ErrorCode::InvalidArgument,
"register operand references an unknown virtual register");
}
Operands.insert(Operands.begin() + static_cast<std::ptrdiff_t>(Index), std::move(Operand));
adjustTiesForInsertion(Index);
Operands[Index].attachTo(*this, linkedRegisterInfo());
return {};
}
Expected<void> MachineInstr::eraseOperand(std::size_t Index) {
if (Index >= Operands.size())
return makeUnexpected(ErrorCode::InvalidArgument, "operand erase index is out of range");
adjustTiesForErasure(Index);
Operands.erase(Operands.begin() + static_cast<std::ptrdiff_t>(Index));
return {};
}
Expected<void> MachineInstr::tieOperands(std::size_t DefIndex, std::size_t UseIndex) {
if (DefIndex >= Operands.size() || UseIndex >= Operands.size() || DefIndex == UseIndex) {
return makeUnexpected(ErrorCode::InvalidArgument, "tied operand indices are invalid");
}
MachineOperand &DefOperand = Operands[DefIndex];
MachineOperand &UseOperand = Operands[UseIndex];
if (!DefOperand.isRegister() || !UseOperand.isRegister() || !DefOperand.isDef() ||
DefOperand.isUse() || !UseOperand.isUse() || UseOperand.isDef()) {
return makeUnexpected(ErrorCode::InvalidArgument,
"tie must connect a pure register definition and use");
}
if (DefOperand.TiedOperandIndex || UseOperand.TiedOperandIndex) {
return makeUnexpected(ErrorCode::InvalidArgument,
"an operand cannot participate in more than one tie");
}
DefOperand.setTiedOperandIndex(UseIndex);
UseOperand.setTiedOperandIndex(DefIndex);
return {};
}
Expected<void> MachineInstr::untieOperand(std::size_t Index) {
if (Index >= Operands.size())
return makeUnexpected(ErrorCode::InvalidArgument, "operand tie index is out of range");
const auto OtherIndex = Operands[Index].TiedOperandIndex;
if (!OtherIndex)
return makeUnexpected(ErrorCode::InvalidArgument, "operand is not tied");
if (*OtherIndex >= Operands.size() || Operands[*OtherIndex].TiedOperandIndex != Index) {
return makeUnexpected(ErrorCode::VerificationError, "operand tie relation is not reciprocal");
}
Operands[*OtherIndex].setTiedOperandIndex(std::nullopt);
Operands[Index].setTiedOperandIndex(std::nullopt);
return {};
}
Expected<void> MachineInstr::addMemOperand(const MachineMemOperand &MemOperand) {
if (!OwnerFunction->ownsMemOperand(MemOperand)) {
return makeUnexpected(ErrorCode::InvalidArgument,
"machine memory operand belongs to another function");
}
MemOperands.push_back(&MemOperand);
return {};
}
Expected<void> MachineInstr::eraseMemOperand(std::size_t Index) {
if (Index >= MemOperands.size()) {
return makeUnexpected(ErrorCode::InvalidArgument,
"machine memory operand index is out of range");
}
MemOperands.erase(MemOperands.begin() + static_cast<std::ptrdiff_t>(Index));
return {};
}
MachineRegisterInfo *MachineInstr::linkedRegisterInfo() noexcept {
if (!isLinked())
return nullptr;
return &OwnerFunction->registerInfo();
}
Expected<void> MachineInstr::attachToBlock(MachineBasicBlock &Block) {
if (ParentBlock != nullptr) {
return makeUnexpected(ErrorCode::InvalidArgument,
"instruction is already linked to a basic block");
}
MachineRegisterInfo &RegInfo = OwnerFunction->registerInfo();
for (const MachineOperand &Operand : Operands) {
const Register *Reg = Operand.getIf<Register>();
if (Reg != nullptr && Reg->isVirtual() && !RegInfo.isKnownVirtualRegister(*Reg)) {
return makeUnexpected(ErrorCode::InvalidArgument,
"instruction references an unknown virtual register");
}
}
ParentBlock = &Block;
for (MachineOperand &Operand : Operands) {
const Register *Reg = Operand.getIf<Register>();
if (Reg != nullptr && !Reg->isNoRegister())
Operand.linkToRegInfo(RegInfo);
}
return {};
}
void MachineInstr::detachFromBlock() noexcept {
for (MachineOperand &Operand : Operands)
Operand.unlinkFromRegInfo();
ParentBlock = nullptr;
PreviousInstruction = nullptr;
NextInstruction = nullptr;
}
void MachineInstr::adjustTiesForInsertion(std::size_t Index) noexcept {
for (MachineOperand &Operand : Operands) {
if (Operand.TiedOperandIndex && *Operand.TiedOperandIndex >= Index)
++*Operand.TiedOperandIndex;
}
}
void MachineInstr::adjustTiesForErasure(std::size_t Index) noexcept {
for (MachineOperand &Operand : Operands) {
if (!Operand.TiedOperandIndex)
continue;
if (*Operand.TiedOperandIndex == Index)
Operand.TiedOperandIndex.reset();
else if (*Operand.TiedOperandIndex > Index)
--*Operand.TiedOperandIndex;
}
}
} // namespace rcc
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